/*
 * Copyright (C) 2000-2008 Jens Nixdorf and various contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies of the Software, its documentation and marketing & publicity
 * materials, and acknowledgment shall be given in the documentation, materials
 * and software packages that this Software was used.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.mopore.jat.util;



public class Crypt {

	
	private static byte[] KEY_PHRASE = "mopore.org key phrase to encrypt".getBytes();
	
    public static void main(String[] args) throws Exception {
        
        String password = "my password is just a little bit longer...";
        String encrypted = xor(password);
        System.out.println( encrypted );
        String decrypted = xor(encrypted);
        System.out.println("The decrypted password is: " + decrypted);
    }
    
    public static String xor(String sourceString ) {
    	
    	NextByteProvider provider = new NextByteProvider();
    	byte[] sourceArray = sourceString.getBytes();
    	byte[] resultArray = new byte[sourceArray.length];
    	
    	for (int i = 0; i < resultArray.length; i++) {
    		byte nextByte= provider.nextByte();
    		resultArray[i] = (byte)(sourceArray[i] ^ nextByte);
    	}
    	
    	
        return new String( resultArray );
    }

    
    private static class NextByteProvider {
    	private int i = 0;
    	private byte nextByte() {
    		if ( i == KEY_PHRASE.length ) {
    			i = 0;
    		}
    		return KEY_PHRASE[i];
    	}
    	
    }
    
    
}
